(Go) Outlook Send Email with Attachments

This example sends a plain-text email with attachments. Other examples exist for:

Sending plain-text email.
Sending HTML email.
Sending HTML email with embedded images.
Sending HTML email with embedded images and attachments.

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    // Important: This example requires Chilkat v9.5.0.68 or greater.

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    http := chilkat.NewHttp()

    // Use your previously obtained access token here:
    // See the following examples for getting an access token:
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
    //    Refresh Access Token (Azure AD v2.0 Endpoint).
    //    Refresh Access Token (Azure AD Endpoint).

    http.SetAuthToken("MICROSOFT_GRAPH_ACCESS_TOKEN")

    // To send mail, we'll POST to the following endpoint:
    // 
    // POST /users/{id | userPrincipalName}/sendMail
    // 
    // (The special keyword "me" may be used in place of a principal name.)
    // 

    // Load the files to be attached.
    attach1 := chilkat.NewBinData()
    attach1.LoadFile("qa_data/pdf/fishing.pdf")
    attach2 := chilkat.NewBinData()
    attach2.LoadFile("qa_data/msword/sample.docx")

    // The body of the POST request contains JSON that specifies the email subject, body,
    // recipients, etc.  This example will build the following JSON plain-text email:
    // 

    // 	{
    // 	  "message": {
    // 	    "subject": "Sample Email with Attachments",
    // 	    "body": {
    // 	      "contentType": "Text",
    // 	      "content": "This is the plain-text body..."
    // 	    },
    // 	    "toRecipients": [
    // 	      {
    // 	        "emailAddress": {
    // 		  "name": "Chilkat Software",
    // 	          "address": "admin@chilkat.io"
    // 	        }
    // 	      },
    // 	      {
    // 	        "emailAddress": {
    // 	          "address": "chilkat.support@gmail.com"
    // 	        }
    // 	      }
    // 	    ],
    // 	    "ccRecipients": [
    // 	      {
    // 	        "emailAddress": {
    // 		  "name": "Chilkat Blog",
    // 		  "address": "admin@cknotes.com"
    // 	        }
    // 	      }
    // 	    ],
    // 	    "attachments": [
    // 	       {
    // 	         "@odata.type": "#microsoft.graph.fileAttachment",
    // 	         "name": "fishing.pdf",
    // 	         "contentType": "application/pdf",
    // 	         "size": <theActualSize>,
    // 	         "isInline": false,
    // 	         "contentBytes": "base64_data_here"
    // 	       },
    // 	       {
    // 	         "@odata.type": "#microsoft.graph.fileAttachment",
    // 	         "name": "sample.docx",
    // 	         "contentType": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
    // 	         "size": <theActualSize>,
    // 	         "isInline": false,
    // 	         "contentBytes": "base64_data_here"
    // 	       }
    // 	    ]
    // 	  },
    // 	  "saveToSentItems": true
    // 	}
    // 
    // Build the above JSON.
    json := chilkat.NewJsonObject()
    json.UpdateString("message.subject","Sample Email with Attachments")
    json.UpdateString("message.body.contentType","Text")
    json.UpdateString("message.body.content","This is the plain-text body...")

    json.UpdateString("message.toRecipients[0].emailAddress.name","Chilkat Software")
    json.UpdateString("message.toRecipients[0].emailAddress.address","admin@chilkat.io")
    json.UpdateString("message.toRecipients[1].emailAddress.address","chilkat.support@gmail.com")
    json.UpdateString("message.ccRecipients[0].emailAddress.name","Chilkat Blog")
    json.UpdateString("message.ccRecipients[0].emailAddress.address","admin@cknotes.com")

    json.UpdateString("message.attachments[0].\"@odata.type\"","#microsoft.graph.fileAttachment")
    json.UpdateString("message.attachments[0].name","fishing.pdf")
    json.UpdateString("message.attachments[0].contentType","application/pdf")
    json.UpdateInt("message.attachments[0].size",attach1.NumBytes())
    json.UpdateBool("message.attachments[0].isInline",false)
    json.UpdateBd("message.attachments[0].contentBytes","base64",attach1)

    json.UpdateString("message.attachments[1].\"@odata.type\"","#microsoft.graph.fileAttachment")
    json.UpdateString("message.attachments[1].name","sample.docx")
    json.UpdateString("message.attachments[1].contentType","application/vnd.openxmlformats-officedocument.wordprocessingml.document")
    json.UpdateInt("message.attachments[1].size",attach2.NumBytes())
    json.UpdateBool("message.attachments[1].isInline",false)
    json.UpdateBd("message.attachments[1].contentBytes","base64",attach2)

    json.UpdateBool("saveToSentItems",true)

    // -------------------------------------------------------------
    // Important: This example requires Chilkat v9.5.0.68 or greater.
    // -------------------------------------------------------------

    // Send the HTTP POST (i.e. send the HTML email)
    resp := http.PostJson3("https://graph.microsoft.com/v1.0/me/sendMail","application/json",json)
    if http.LastMethodSuccess() != true {
        fmt.Println(http.LastErrorText())
        http.DisposeHttp()
        attach1.DisposeBinData()
        attach2.DisposeBinData()
        json.DisposeJsonObject()
        return
    }

    // The send succeeded if the response status code = 202.
    // In the success case, there is no response body.  (We just get the response code to know that it succeeded.)
    if resp.StatusCode() != 202 {
        json.Load(resp.BodyStr())
        json.SetEmitCompact(false)
        fmt.Println(*json.Emit())
        fmt.Println("Failed, response status code = ", resp.StatusCode())
    }
    else {
        fmt.Println("Outlook Mail with Attachments Sent.")
    }

    resp.DisposeHttpResponse()

    http.DisposeHttp()
    attach1.DisposeBinData()
    attach2.DisposeBinData()
    json.DisposeJsonObject()